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Un sobre perfeccionado caracterizado esencialmente por el hecho de comprender interiormente y a lo largo de uno de sus bordes un elemento filiforme contínuo oculto totalmente en la dimensión del sobre presentando este en uno de sus ángulos correspondiente a uno de los extremos del elemento filiforme citado un trepado que facilita el inicio de la maniobra de apertura del sobre por tracción del elemento filiforme y rasgado del borde adyacente al mismo.